Edith —, French singer known as the Little Sparrow (4)
I believe the answer is:
piaf
(Other definitions for piaf that I've seen before include "French singer, the Little Sparrow, d. 1963" , "See 6 Down" , "French singer who regretted nothing" , "Edith -, Fr. cabaret singer (Non, je ne regrette rien)" , "Edith, the "Little Sparrow"" .)